f 100 plants are produced in F1 progeny, then how many plants will show the recessive trait? (Term II, 2021-22)

To answer this question, we need more information about the genetic makeup of the parents and the type of cross being performed.

In Mendelian genetics, if we are dealing with a monohybrid cross (one trait being studied) of two heterozygous parents (Aa x Aa), then the ratio of dominant to recessive traits in the F1 generation is typically 3:1.

However, if the cross is between a homozygous dominant parent (AA) and a homozygous recessive parent (aa), all F1 offspring will show the dominant trait because they will all be heterozygous (Aa).

If the cross is between a homozygous recessive parent (aa) and a heterozygous parent (Aa), then the ratio of dominant to recessive traits in the F1 generation is 1:1.

So, without more information about the parents and the type of cross, it's impossible to determine how many of the 100 F1 progeny plants will show the recessive trait.